* add pmd and owasp dependency check through -P owasp profile
* suppress full stack trace in log
* revert to spring 2.2.0 as 2.2.4 failed in travis
* added owasp dependency check maven configuration details to vulenerable
lesson page 7
* Remove method `getId()` from all lessons as it defaults to the class name
* remove clean up endpoint
* remove unused class `RequestParameter`
* remove unused class `PluginLoadingFailure`
* Move `CourseConfiguration` to lesson package
* Add more content around the lesson template lesson and make it visible as a lesson in WebGoat
* Remove explicit invocation `trackProgress()` inside WebGoat framework so assignments only need to return an `AttackResult`
* Put original solution back as well for SQL string injection
* review comments
* Add
* Remove Guava dependency from WebGoat
* Add Checkstyle to the project with very basic standards so we have a
style across lessons. It does not interfere with basic Intellij formatting
Avoid these compilation errors:
```
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjectionExecute.java:[47,8] class HttpBasicsInterceptRequest is public, should be declared in a file named HttpBasicsInterceptRequest.java
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[38,8] class HttpProxies is public, should be declared in a file named HttpProxies.java
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[5,33] cannot find symbol
symbol: class AbstractLesson
location: package org.owasp.webgoat.lessons
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[38,34] cannot find symbol
symbol: class AbstractLesson
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[39,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[44,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[49,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[54,5] method does not override or implement a method from a supertype
[ERROR] /tmp/app/webgoat-lessons/command-injection/src/main/java/org/owasp/webgoat/plugin/CommandInjection.java:[59,5] method does not override or implement a method from a supertype
[INFO] 9 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.356 s
[INFO] Finished at: 2019-10-19T21:13:03Z
[INFO] ------------------------------------------------------------------------
```
